Final answer:
Franklin Roosevelt expanded power through executive orders, Harry Truman used veto power politically, and Andrew Jackson bypassed Congress and utilized vetoes strategically.
Explanation:
Franklin Roosevelt: Expanded presidential power by greatly increasing the use of executive orders, especially during the Great Depression and World War II.
Harry Truman: Used veto power for political reasons, influencing legislative initiatives.
Andrew Jackson: Bypassed Congress to declare war in Korea and employed veto power extensively to block legislation he disagreed with, changing the way vetoes were used.
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